John 4:46-48

So Jesus came again to Cana of Galilee, where He had turned the water into wine. And there was a certain royal official whose son was sick in Capernaum. Having heard that Jesus had come back from Judea to Galilee, he went to meet Him and began asking Him to come down and heal his son; for he was at the point of death. Then Jesus said to him, “Unless you [people] see [miraculous]signs and wonders, you [simply] will not believe.”